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package/network/services/ead/src/tinysrp/bn_shift.c

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+/* crypto/bn/bn_shift.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "bn_lcl.h"
+
+int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
+	{
+	int i,nw,lb,rb;
+	BN_ULONG *t,*f;
+	BN_ULONG l;
+
+	r->neg=a->neg;
+	if (bn_wexpand(r,a->top+(n/BN_BITS2)+1) == NULL) return(0);
+	nw=n/BN_BITS2;
+	lb=n%BN_BITS2;
+	rb=BN_BITS2-lb;
+	f=a->d;
+	t=r->d;
+	t[a->top+nw]=0;
+	if (lb == 0)
+		for (i=a->top-1; i>=0; i--)
+			t[nw+i]=f[i];
+	else
+		for (i=a->top-1; i>=0; i--)
+			{
+			l=f[i];
+			t[nw+i+1]|=(l>>rb)&BN_MASK2;
+			t[nw+i]=(l<<lb)&BN_MASK2;
+			}
+	memset(t,0,nw*sizeof(t[0]));
+/*      for (i=0; i<nw; i++)
+		t[i]=0;*/
+	r->top=a->top+nw+1;
+	bn_fix_top(r);
+	return(1);
+	}
+
+int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
+	{
+	int i,j,nw,lb,rb;
+	BN_ULONG *t,*f;
+	BN_ULONG l,tmp;
+
+	nw=n/BN_BITS2;
+	rb=n%BN_BITS2;
+	lb=BN_BITS2-rb;
+	if (nw > a->top || a->top == 0)
+		{
+		BN_zero(r);
+		return(1);
+		}
+	if (r != a)
+		{
+		r->neg=a->neg;
+		if (bn_wexpand(r,a->top-nw+1) == NULL) return(0);
+		}
+
+	f= &(a->d[nw]);
+	t=r->d;
+	j=a->top-nw;
+	r->top=j;
+
+	if (rb == 0)
+		{
+		for (i=j+1; i > 0; i--)
+			*(t++)= *(f++);
+		}
+	else
+		{
+		l= *(f++);
+		for (i=1; i<j; i++)
+			{
+			tmp =(l>>rb)&BN_MASK2;
+			l= *(f++);
+			*(t++) =(tmp|(l<<lb))&BN_MASK2;
+			}
+		*(t++) =(l>>rb)&BN_MASK2;
+		}
+	*t=0;
+	bn_fix_top(r);
+	return(1);
+	}